Commit 3617d270 authored by Linus Torvalds's avatar Linus Torvalds

Only allow sendfile() on destination descriptors that know

about the "sendpage()" callback. Don't try to fall back on
a write with the page kmap'ed
parent 6ba24a9c
...@@ -1262,7 +1262,7 @@ ssize_t generic_file_read(struct file * filp, char * buf, size_t count, loff_t * ...@@ -1262,7 +1262,7 @@ ssize_t generic_file_read(struct file * filp, char * buf, size_t count, loff_t *
} }
} }
static int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long offset , unsigned long size) static int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size)
{ {
ssize_t written; ssize_t written;
unsigned long count = desc->count; unsigned long count = desc->count;
...@@ -1271,22 +1271,8 @@ static int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned ...@@ -1271,22 +1271,8 @@ static int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned
if (size > count) if (size > count)
size = count; size = count;
if (file->f_op->sendpage) {
written = file->f_op->sendpage(file, page, offset, written = file->f_op->sendpage(file, page, offset,
size, &file->f_pos, size<count); size, &file->f_pos, size<count);
} else {
char *kaddr;
mm_segment_t old_fs;
old_fs = get_fs();
set_fs(KERNEL_DS);
kaddr = kmap(page);
written = file->f_op->write(file, kaddr + offset, size, &file->f_pos);
kunmap(page);
set_fs(old_fs);
}
if (written < 0) { if (written < 0) {
desc->error = written; desc->error = written;
written = 0; written = 0;
...@@ -1331,7 +1317,7 @@ static ssize_t common_sendfile(int out_fd, int in_fd, loff_t *offset, size_t cou ...@@ -1331,7 +1317,7 @@ static ssize_t common_sendfile(int out_fd, int in_fd, loff_t *offset, size_t cou
if (!(out_file->f_mode & FMODE_WRITE)) if (!(out_file->f_mode & FMODE_WRITE))
goto fput_out; goto fput_out;
retval = -EINVAL; retval = -EINVAL;
if (!out_file->f_op || !out_file->f_op->write) if (!out_file->f_op || !out_file->f_op->sendpage)
goto fput_out; goto fput_out;
out_inode = out_file->f_dentry->d_inode; out_inode = out_file->f_dentry->d_inode;
retval = locks_verify_area(FLOCK_VERIFY_WRITE, out_inode, out_file, out_file->f_pos, count); retval = locks_verify_area(FLOCK_VERIFY_WRITE, out_inode, out_file, out_file->f_pos, count);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment